You need to reset it to factory defaults. Several youtube videos can help you (I have exact printer but book is put away). Have you done anything to it lately with ink cartridges and the like? may need to get some mineral spirits, take out ink cartridges, and clean contacts with swab. Try the reset first, though.
SOURCE: USB port problem
I would try first of all making sure that all of your drivers are up to date. I am saying this because it is always a good first step, but I am not 100% confident that this will fix it. There are a few updates that are listed as URGENT for your specific computer. The link to your drivers is below. The main one that concerns me is the Intel Chipset Driver located under chipset. This is listed as URGENT and may be a solution to your problem. The chipset is part of the motherboard that can be responsible for controlling your USB ports. If this does not remedy the situation I would contact Dell support for a possible solution.
http://support.dell.com/support/downloads/driverslist.aspx?c=us&cs=19&l=en&s=dhs&ServiceTag=&SystemID=PLX_GX620&os=WW1&osl=en&catid=&impid=
SOURCE: Won't print black
MY DELL 725 PRINT WILL NOT PRINT IN BLACK INK. I HAVE A NEW PRINTER. I EVEN BOUGHT A NEW INK CARTRIDGE AND IT STILL PRINTS IN GREEN ONLY. WHAT CAN I DO TO HAVE MY DOCUMENT PRINT IN BLACK?
SOURCE: display properties
Download this, run it, and click Yes when it asks if you want to "add this information to the registry."
http://www.kellys-korner-xp.com/reg...
Let me know how you made out, and please rate my answer.
SOURCE: Black ink cartridge is 2/3 full, but doesn't print
Normal
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Driver could be corrupt.
Disconnect the printer or at least be sure it is turned off.
I'd do both and reinstall the CD software program that came with
the printer. When the software program asks you to connect the
printer to the USB port, do so and it should again work properly.
Hope this helps. Bud
SOURCE: Scanning problem with A940 AIO Dell printer/scanner
Hi there, just found this solution to work perfectly. i just freaked out for a moment with the same problem. Use this or just type fax and scan in your help function. Hope this helps!
Before you begin, make sure that you've installed your scanner on
the computer and that the scanner is turned on.
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